1, the use of hydraulic jack must check whether the normal parts. 2, the use of hydraulic jack should be strictly comply with the provisions of the main parameters, should not exceed the overload, or when the height of the lifting or lifting of the tonnage of more than a specified cylinder, the top of the cylinder will be a serious oil spill. 3, such as manual pump body oil is insufficient, need to be added to the pump should be fully filtered N33# hydraulic oil to work. 4, electric pump, please refer to the instructions of the use of electric pump. 5, the weight center of gravity to the choice of proper and reasonable choice of Jack's focal point, to pad the bottom level, taking into account the hard and soft ground conditions, whether to the wood liner tough, place is stable, so load subsidence or tilt. 6, Jack will be heavy lifting, should be timely with the support of the strong support of the firm, to prohibit the use of the jack as a support. For a long time to support weight please choose 7 for several jacks while lifting, in addition should be properly placed Jack should use more than the top shunt valve and each jack load should be balanced, pay attention to keep lifting speed synchronization. Must also consider the weight due to uneven ground may subside, is inclined to prevent lifting heavy objects and dangerous. 8, when using the manual pump of the quick connector and top docking and choose the right position, will pump oil drain screw is screwed, can work. Wants to make the piston rod down, manual pump handwheel according to counter clockwise slightly loosen cylinder unloading, the piston rod is gradually decreased. Otherwise, it will be dangerous to fall too fast. 9, separation type jack system spring reset structure, lifting the end, you can quickly remove, but not connected to the hose to pull the jack. 10, due to the lifting of the lifting jack, the user should not exceed the rated travel, so as not to damage the jack. 11, the use of the process should avoid severe vibration jack. 12, is not suitable for the use of acid and alkali, corrosive gases in the workplace. 13, users should regularly check and maintenance according to the use of the situation.
Verification method
1. The pressure test machine standard time, Jack installation in testing machine plate geometry center, start the test machine, the plate rises about 50mm, to eliminate the effect of the weight of the jack, and then testing machine reading dial pointer to zero.
2 jack up the piston 100mm or so, then the test machine on the press plate moving close to the jack piston, officially entered the standard state.
3 check when the piston running direction of the jack should be consistent with the actual working direction, according to the actual work needs, can be used to test machine (active calibration) or test machine pressure jack (passive check). When the jack adopts the oil pump, the oil should be slow.
4. Formal verification should be according to the predetermined load difference first readout testing machine load value (KN), and also read out jack oil pressure gauge readings (MPA), and prepared to record, until the verification required ratings, duplicate check 2 times, reading more than two times of the mean, as the last check value.
. the counter force frame check; a jack is arranged on the counter force frame plate geometric center position, then the force sensor or a pressure ring is arranged on the central position of the jack piston and the jack piston rises about 50mm. Formal verification before the force sensor mechanical readings zero adjustment or pressure loop to adjust the initial reading. Then according to the predetermined load differential check, first read the force sensor readings (KN), and read the jack oil pressure gauge readings (MPA). Repeated 2 times, the average value of the above 2 readings for the final calibration value.